Both of my 2610's currently have 8M of flash. I see I can upgrade to 16M, and on eBay it looks like it'd cost about $5 per router. Upgrading the ram from 32M to 64M (I'm thinking it's just a 2nd 32M stick, right? cisco's site says most 2600's have 2 banks) is another $5, so fully upgrading the 2 would be ~$20.
I'm checking for opinions on whether it's pointless to spend even that $20 on such old routers. I'm kindof torn on it.

You can only get so much out of an 'old grey mare'.